Gregory, Ross. "Politics in an Age of Crisis: America, and Indiana, in the Election of 1940." Indiana Magazine of History 86, no. 3 (1990): 247-80.
Books
Barnard, Ellsworth. Wendell Willkie: Fighter for Freedom. Marquette, MI: Northern Michigan University Press, 1966.
Dunn, Susan. 1940: FDR, Willkie, Lindbergh, Hitler―the Election Amid the Storm. New Haven, CT: Yale University Press, 2014.
Lewis, David Levering. The Improbable Wendell Willkie: The Businessman Who Saved the Republican Party and His Country, and Conceived a New World Order. New York City: Liveright, 2018.
Madison, James H. Wendell Willkie: Hoosier Internationalist. Bloomington, IN: Indiana University Press, 1992. Neal, Steve. Dark Horse: A Biography of Wendell Willkie. New York City: Doubleday, 1984.
Peters, Charles. Five Days In Philadelphia: 1940, Wendell Willkie, FDR, and the Political Convention that Freed FDR to Win World War II. New York City: Public Affairs, 2009.
Severn, Bill. Toward One World: The Life of Wendell Willkie. Washburn, 1967.